Air filtration apparatus



FIG. 1 is a top front perspective view of the air filtration apparatus, showing my new design;

FIG. 2 is a right side elevation view;

FIG. 3 is a front elevation view;

FIG. 4 is a left side elevation view;

FIG. 5 is a rear elevation view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view.

The surface shading on the illustrative air filtration apparatus is intended only to show the character and contour of the surfaces and not surface indicia. 

The ornamental design for an air filtration apparatus, as shown and described. 